Centering attachment



April 17,1945. T R, C: T' RNE 2,373,927

I CENTERING. ATTACHMENT Filed Oct. 27, 1943 'Jlayfizmui a Zhrner;

BY v

ATTORNEYS a drill presS illustrating Patented Apr. 17, 1945 UNITED .STATES- PATENT OFFICE I I 2,373,927 Y U OENTERING ATTACHMENT v f Raymond C. Turnencolumbus, Ohio Application October 27, 1943, Serial N0.507,845

4 Claims. (01. 7755) My invention relates to drill presses, and has among its objects and advantages the provision of an improved centering attachment.

In the accompanying drawing:

Figure 1 is a fragmentary elevational view of my invention'applied thereto, and v Figure 2 is a top view.

In the embodiment of the invention selected 1 for illustration, I makeuse of a, bowed arm I!) having ahead l2 provided with a socket or home for the reception of a marking needle I4. This needle may befixedly securedto the head by a set screw IS. The opposite end of the arm l0 lies between ears l8 on an extension arm ZD and" is pivotally connected therewith, as at 22. A stop 24 is formed on the arm III to engage underneath the extension arm 20' and restrain the arm I0 from downward pivotal movement beyond a predetermined position. I

The extension arm 20 is provided with a slot 26 for the reception of a screw 28 threaded into a supporting arm 30. The supporting arm is in the nature of an L having avertical rack 32 slidably guided in a U-shaped extension 34 on one section of a split clamp 38 which may be fixedly related to the drill press column 38 through 1 tightening of the bolts 40. A gear 42 is rotatably journaled in the extension 34 and meshes with the rack 32, this gear being provided with astem 44 through the medium of which'the gear may be rotated for imparting longitudinal movement to rest ofi the arm 20 through engagement between the latter and a stop 58 on the arm. The arm l0 is easily adjusted vertically through the medium same for use under of. the rack 32 and its meshing gear 42.

' Without further elaboration, the foregoing will so fully explain my invention, that others may, by applying current knowledge, readily adapt the Iclaim: I

1. In a drill press having a drillmount, a column and a work supporting table, the combination of a clamp attached to said column and provided with a rotatable gear, a rack meshing with said gear and slidably guided in said clamp for movement, longitudinally of said column, said rack having a supporting arm, an adjusting arm slidably mounted on said supportin arm, a screw for clamping the adjusting arm to said supporting arm, an upwardly bowed arm pivotally connected with said adjusting arm for rotation about an axis at right angles to the axis of said column, and'a pointed marker carried by the free end of said bowed arm and arranged to engage work coaxially with the axis of said drill mount.

the rack 32 when making vertical adjustments of the arm 10. A set screw 46 is threadedthrough the bight of the extension 34-for end engagement with the rack 32 to secure the latter against accidentalmovement.

. Figure '1 illustrates the column 38 as extending upwardly from the drill press table 48 for supporting'work 50 underneath the drill 52 carried 2. A centering attachment for a drill press having a column and a work support, comprising an arm, means adapted to secure the arm to the column for adjustment vertically with relation to the work support, and a second arm carrying a marker and pivoted to said first arm for movement into upright position thereon or into a horizontalposi-tion thereon with the marker in column for vertical adjustment with relation to the work support, a second arm mounted on said by the drill spindle '54. This construction is old' and well known in the art.

In using the centering attachment, a drill is inserted in the spindle 54 and the work-531s then adjusted sothat the .drill will contact the work at the exact point desired. The work is then secured to the table by a clamp 56. The arm I0 is then swung into the position of Figure '1' and is adjusted for length so as to bring its needle first arm for adjustment in the direction of or l4 into registration with the mark placed on the work by the drill. Thus the arm ID will be adfirst arm for adjustment in the direction of or 4 away ,from the work support, and a third arm carrying a marker and pivoted to said second arm for movement into'an upright position thereon or I into a position extending horizontally therefrom with the marker in contact with the work. 1 4. A centering attachment for a drill press having a columnand a work support, comprising an arm, means adapted to secure the arm to the column for vertical adjustment with relation to justed sothat the needle l4 will always contact the work coaxially of the'drill axis. This eliminates the necessity of employing the drill press point for centering work. The drill will always bore coaxially of the mark placed on the work by the needle. This attachment eliminates the necessity of centering punching work. The arm I0 may be pivoted upwardly-and brought to the work support, a second arm mounted on said second arm to maintain the third arm in either of its positions.

1 RAYMOND C. TURNER.

various conditions of service. 

